PIX firewall 525 on Voice Network for 5000 CC calls

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can some one suggest me will it be recommended to use PIX firewall 525 on Voice ( sip ) network for 5000 CC to 1000 CC calls in signaling mode since our server are using public IP so will i be able to use it without NAT / PAT also will there be any issue of QOS .

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If your idea is to add some security between your devices the PIX will work fine (I will prefer and ASA since it can run the latest software). The quality of your voice traffic shouldn't be impacted by the PIX.